HomeMy WebLinkAboutBUTTE CO. PLANNING DEPT. 77-22 5V ;WARD OF 'CRJST6�sY o �) ° " I t: t� 9 �ff!rr? WiLLIA1 19 tit
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Butt`e County`lannang:Depsrtment
6 I7� -, dun'y Celiter Drly
6via rbCal. if id- `�35965" o
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Subject; `Coxnr4f.%nts 'bn„E, L R4,°. Ear' Safety )
Element of $kitte County..General 'lr!lan
'> and the Safety` r*leiaient its elf.
° Ge]atlezYitin:
OUT specific e,amrnet is oticern pages 10-5,.i,06df..the Draft E, x, R4 and
pages `51 'a5 of fine' undated copy of the ,3 lateist Elerhents s'ent;.with our
lgttez of October s
, R
arl Spec zicallj�, we suggest +:tre fotidiWing changes in the Safet+j;'tlement.
1. age 51. (under $utte"$asinj add a stafexa� aboutflat' ser -lout
disease conditions follt;,'V xng Winter flooding of the Ba8ln, .V►yy�ixianls re't'
Aavlrio and Roneut 1�re ��C. These areas would be expootei to Produce,
�e
C5 larger nunlbers;. of Cute `taxsalzs:} the ve'ctor+^of encephalitis, With de.:
lsyecl; drying of £loo°areas, o owing Winter flood conditions,
�
o
( A p g p. Cx e ek `drtsiai
. a e 52,.r dcl, a and 146incut
` aha ra h an Butte Creek
ages,; anfl ehelt ll.00d, p611entis] and oorisequent disease risk,
'3. gages 5.3-`54 tunrle5r 9 e,ilr t >arishig to other G, P. Elotxiei ts), ' Abs'encer"
�:' fwtrgg .�tlasoase cunsecuences till flooding Would be
af%ny obtric�us place vcrhe�t
con`sad6ke,srt u. ests ie� i� ec fnr ,: itealtli:,elex>i eiit to the Geizerai,Plan;
"j m%�
5r�t
4., Pages '5w5`r1 .Add tot(Nlitigation Me�'sUtes a sentenco cot:;cleriiag,
o the ltt r.ge. bonofi.t of upsit �#n storage do reduction of disease potential.
,} „ l_�Y
In sdditiox, the,, xiitigation should co�asider a joint p+�wors agreement with
Counties to the South to cohstruct a bypass s�rstota, cci# ecting to the Sutter
$ypass`, alohg Wath a low level, e -renal, topping lot�efi and drilh. a ohairxaels;,
to get the, water dr, as e, a�ay, as prop6'sed by Rtelarriatit�n`Dir�trxct+ h �i. �. �° s ')
ca
F +, We nugge t the following 6dditions` end charges in the `t�,'a.ft 1:1.I.
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BUTTE ' C,OUE�?Y �;LAyP�I�t�G tlah�iliI�SS`I�N
, 11N`UTltS QctoSer 28 ``;r
c Iy ,
r
7�7- 32 -1 6 3
•-
C:ounsel 'stated that n .rev` d to��th`e `Gene/ �� �Pla�ri,,'et t`ha
r , �•
�`1 1 Counaty and the,�At4nrrrey' G� ra `f eve a;j;"' �t "o a' ;;,�7p,t�i�lat,j',o ' � icy r6
,the,County wi11.'reo`ei��ve dp4tonl�tionai ex;t+enson o,,�°�me unti4xr
IS X1967 and radded t at tliet.''rt"ornr�r r�ion `will be recp'i vi n n,, h,�� .`l ,a4
Y a
a campl:ete lteix`;; of 11t at;,
,n4, }ie said that' the 'Board' 0�5uo�
w d ,� t �'
viSor'�, o:i �c�t���ber X6,1, tad �lfan;f 'gYee�men ,lith CN �O Hfi y Vthe Eby +�1�
thetir firm w�l1 act as ve6niV:J1,�ants and icompl`ete t�n,e mlis`si4,gl�r:elem n t s
k i �' +i l Cl a I ? f
of tF'te�;� General, P1 an an ' i Ie d��a t .e-nwti ranmenot��al d'ocumen�ts ! ty-Q11
ilegardipng the public hea'rin.' hiCh his been •S`et for eNovc�mb+'4 i'';
,was hlls reco-mmendatioh that�l�t -°he64-1rig due cb'nduete&I �utltt� t, to
thrust of :°the,, ear` n9 bye del ecte totva�^d rec�e�V�i�ng input°�,��F,� �t� th.
publ P and that this: informa-taon be forwarded to :the :cangUl tlan � He
-affo � ai s' .tha�t� pc �rft 0f ti 6',,a,gr•etment ma, gee Iby,�;the Attor41i`e ,: d � 6e,r61�4 s
th t thtxe 1 e a min��lum of 3 ,hear�,ngs 'iin vol ous
CIwc,tentems of the Coun'tY�,i-Chidci,> paradis'v',, Oroville,:it
G�ridle�� a�;ea 1�,5or�et;�,me ,after i�tihe mi�d.d1 e of ula��nuary, ad b`hat t -tree
I�
Aria f t s w i T1 �t�e= aor61p1 ete�, and t,�i 11-. have been gi_vert e i reel 't H'e
Irdoommen8ed "ILI a, r�4cnmm� t`tee � r��ade 'of -the commissioners a ttef rld t'he Various
s
`+ H I.addbdl,th&t fRe jinformati.on gleaned :fro the p� tnee'tanns
r.
hl.me et i n g s .
v�u1 d< al so bo 'f bilwarded to tI `e cons.u'l tants . He further +5 tO' td'
t el5 'e Ob U-1 fid' -b; n �I t i 'c a d„' h e a �r a �i�`g s :►?, ,,
� d
t^ `oinmiisinn��er G lb°e�rt stated hat he believed the fu11 �Cotnt � s1 ►A
4- c ;3 hP�ar�ngs After some di sc,uss, on k y tYr+` Com +1,s•sion
�hou1 a teen t�
?� atr,d Coun.5 1 it ��as�,d�th4 t0i'ltensus that' as many members- of.�tie C°o is.`sion
�� g '
�co�nductetl1;asSCor l a�`si��ni�i ea�rines�vor�.tns hearin s and that They '�11 be'
r 1 ' g n e General Planr
nl Regaridirig parbel ma+ tii and subdivision maps on the agecida 3��:onight :h�
said t�j'at then Wtet!; 4o b` ftewarded to the Advisory Agentcyr for ith,a`l
ll�l �iIbttioit; acid thaff 'Lounsel W i`l send ,a form letter to the a(plicant.s �
,�,tkl ting wh�on tr e jfrla'p5 w 11 be owns dertd
,
Aq
„
� 1 4
..»°t �; i♦a.c., _- .�. ,. 44:. _.. � ., .. . �� J� (k�.l!' Y'�.'�bi�ilY
4
trin,5,mtm „raad t0dt}c,. clea'xancesnclstructures, and geologic
, 11dzax%
d mappin . in ax+eas of known geologic" hazax°d. it
The S- ate of California has g,%and:ated this element to' insure
that totalF':gov.p,rnmonts -take certKlln hypes of`hazardsbinta account "
in the, x planning `ptograms. 111, order to fu il'1 that i�ltentibn,,
Butte `bounty milst cDhce�rn itseLf with the 'xelatxonshxps ,en
develdpment standards, hazards .aff f1. and geoloai,c movement, and
government r, spons�es to such cal am tics The•.objeot"Vb of ;this
e�omer�t , 'is tllusyto xeduco the los$ 0" 111 e, injury: p�ropertj�. 'damage, ,
{ j uld socio-econom10 aigox4der ivh�ch foldof;I,'a landslide, earthcl�ual,o,,
Ira,, �nr f1'aod, "
fay
In
* i , I ]DISKS 'OP', NATURAL IAZAP0 ..,
{ The're ''axe thrc6e charges ,liven o public °ofl xCialSo byfi ,the
Gove�r�.`ox�'s 'Batthrjua�ke 'Council': ":..: to reduce las �;o xiie„ damages
to pxop'ert , and ,ecc�llomic �nd social dislocations resulting from
r
futureq 2f -
Tliese three conc'e"bns a.i'e not, 'Goiitx dx'ctrry„ox in, 'O`p,ertdeAt but
treys distinct'. pox any _sing hazard, there axes"entaally,
three separate risks wasct1 titUst tie orva,Juax.,ed The ° xis `o£ burr an
sfe; yto pxopext'y,rcl „the xis o dixtpitan. tri: e�campe„ d the
last i. utility StruttutdS wh,� chi ti� .,damaged' 1t�ay prt�duce l � tt e
I 1} the way of direct damage to safety and prapert but Would gxatly`
disrupt the functioning of tho. cb'nmunitv and its sere es .
„
�.
1ne�tlably an taking Ilas a ,pertain'eltel o risk a5s`'acza-
Y • y g
with it, y In addit�.oni there 'is nearly' alti��lys a tura°de- Pf "between
c 5t..,, and risk �i+cdu�t�on or mitiga I ion.. Therefor ) the s;:imp IL
° statement ,that tutte OoUhty must eliminate-or -reduce 'all hazards, is
both , imp,,•ractical and unnecessarily restricti, &,i At some .eve , a
risk becomes.; in some i,�ay, "i-Itteptehle", The acceptabi i'ty of risk
depends 'on :the nature of the risk,. " I1ppa.retitly, tho�,pifblic is 14,1111ng
to accept;: a higher vista because of an activity In which ,they choose,
to `engage ;iii; s c11 s ski''ing," w ac'h is voluntary. par lvoltlntar F1
actii hies the i evel cf � risk %vth' ch 'is rtcepta`ble � i�s, much 16,w6r,
por� something ljk sol.smic -eisk where there � s litXle of a vo�.u:ttary
natur`b and in addition' n.o directly obvious sour'e or- pleasure or
profit., the levo which the � � isk is very lows
u iU shoulr reduce r
Appropriate risk levels . hould be determined with maximum c3'. ti
yen irtp�tt. The appx ipt4iate p Minim;
response to a pote tia ha�ar'd
itx a es a' i udgement, either e sl ica t or a pli�cit �, o 'th'e r sk thAt
is Ott pt-able, `here” l s no sus 1 thing .ass, a perfectly , hata,rd-free µ
ortvi�R nmert't, ,attta;al, apd mantnac e ham rds of same �� nci and 'degree �a�
all ayS present. However) efifects can be .p�,=oducti�Fel,y undertskeri �o
Mtig�'.to .the consocluenoes of known hazards.
4�
Ma types of ha zaras are Or have becon''O relatively wo I
S programs A and. s stomatrc i�iste tedu tion ra •rams axe wal est'a.blxsl'ed,.
Pot example society proVjdOs, c tansive p' ograms to reduce the riste
from re because the disk is e �'tivoly high Most °cornmun�.ties
4 „ ovid, fade fighting, oquipmolt, §c el children have tir 'P,atitIs �
4 v
0
y
dlt ti pl�� r' 8 r fi e
i
..
and plaes,:}o busznessia�re e�ttergency l t xe axtxnit�..illos s. F.:xthe.x,,
e Litsuranco is n stab,] is�xod wg) o ,`li ,a and ' to nd iS'txi .1
proVxdos e.xtonszv.e p�eg�ams tti' reduce r:is:lc £rom 1.� "o becasd'"t' is U ,
good, 'business to 'ado so r� a .
though the apprc a,c'h is r{ t t :di ferent, tie degx�e„ryo� risk I
xom flao3s .also a s rel a;vely welt defined, Tliroir; i and1)r1;'xs (based
upon" pas`t, dro,logic, ;r 'tt>rds and .s atis xca.l theox y flood hazard is
; ! qua t:e h�el.1 �l{�1t�eZ`StOot� a ��nr w� th appr p ate, load control. vorks
t rt and/ox's lan�lyt se Planning ng �. td on�.ngi the �cis�c cari. be `�ar�e1� redu�ecl;
Tbe,."fact' that disaste o s 7,00ds stI1'a Occur ca,n be ,•'tif,.�+jj;t6d tiro! e
xnapprop'ri:ate .la.x�d ,use ar inadeq,+te flood contx� woks rathox
than poor understaziuing 4 'the potettl�l risk
j
° in the ,context of .;this elerAeitt t'he �ohleat of rsk xs cine of
v „; pulayl c 119ol'icy aniir't}ie, appropiiatel al lt�c''d .0 of` publ.i re' !aurccs t4
' T e0p
�fratnowor� hxna.
g rds.. pi—at
Spon' r �Y1t��TI,�s tca 04�do s
y1wr�ich a commu ity, as ,,opposed `uo' �nti�vic utl ! espon�s ,
to th.e quost,x on .cin �� me'an�rig�u t . Th'��' �ixs��' essen��� a� s ���,_� ,� Is the
� recopit on o
the:
pr ' ence" of , . �ha�z'at d c
, v' lnoe the probm has beri recognized, C. 's eet`_�.s
required to eual trate its l a ke1v ,setxevit, _ freque,,, aria the cl arc`
E to r isti-es of the areas; 1,nv`o ved
tVALUATZQN RTS(` .L1 VET15 �~
= a
1nv�oylunta:r�
��x lY}tere''the public has no choace 10 t.t tt- r hot to submit th`emse .ves
,
to risky cottain public aiid private �s $11Q��1d be assigned' a ..
lOvel of =acceptable rjs�: w1lich' is q tit:�'�] ot�r i�ux� dings , and, grid uses
'regtE.?xing involuntary,, occupancy include liosp talc_, coTiva.l.:escelY`i �• home's 'f
`� r6un')s 'and,
Schools ,.
� � 1s � l,� ,;
A �OTY',10W l,e'�e1 o ` acc,6-otable t(lsk ex asureJ shoilld- be "s 'geed
p
11P,
to Certain cr too"a1 l acili s` whit pri�vIdo osse�ttial se~"
r d.uring,� disasters , 'hese emex�'gent;Y services and p;ttbli c uta,l.it;; Pac l
ties inclugIP� hospitgx,s i fire anal "police s I" ons , power Plants
e� teleahon;e fa'C l.lt of , wee .ex~ ndse 5+ g'o aca t es ha, lil, �mr �3
F
, ;high vaj�s j bridges, �'etparI.ose5 n,d interchange railway st at�t.ons,
A
dait�s and �resetVo'r8 „n
Er 3�t gh gccup:ancw art 'Lo.r
1 o +tee, aceeptab:le 1 e *e17 0 ri s� �hotilld i` roqui red for `buil d3 digs it
And land uses ha in � hi h,"occm ane: facto A buil,ditig with—ii
i' p tip J, pr:o,pie�,bto a.` g'ivo g olog c�'
ugh occti anc rats wa1�41 e� ose., mangy mono
flood and Pare hazaid Phan a buildings with\\a 161%, oecupa.nc�y°� 1ls.tea
High' occupanc�r bti ld ngs 3ncl�u e and � �or ung, thbatdn 0 ehurch6s,
Shopping centers, ltrg r 6tols.) hot6l.s, end largq o� l ase buildings.
j 1 ,, ts
I
tkis,f.ng build''itigs and l,an�.:;: per, sh�d tau
also '�So���e+tai`uated dor
`+rc'`<3etermina'tion of �eceptab'' ris?cAmong thewme.aks avail a.bec,x the / l FI { 1 f
r1 W
�t
;1bT exing :of .h .gh risk situa`ti'ons with existifig .stt-Uc' bvds, are:
'phis cal aiteratiax► (ab,atemeri#� of struc.tura hazards]�') vb ocat o x.
andlor. demob ition bfF' stxuctu"��es acid change of use of nth uctures
(Fxoxn high,to :low occupancy for e�tample) s ' n any` 'caso tho cost of .
F
gaining an acc.ept,ab� e :i,e,vel oaE risk should be commensViate with
benefits ;gai.ned . , �.as d upon the 5'imited s eisina c and bl ogirc data c�
avail,ab e.� for;p ohe planning a.;.'ea, ,it:.wot.ld be' OffaCu�Lt` �br s�'�';ucl:uxa�
engineers t:o ;evaluate existifkg�)8trUtturos for determination of
"
(accestableyri 'k Abandonment e£ unafet) struc'tuxos would kayo` d`arect(
�beneitsby s(pxev;nting dos of ;lie injury andtrop'erty„`'damage..
T}ese same benefi`t.s can be'b ought `ab.out 'by' ;toning of the and an y J
the basis kof geoipgic, fIP0cl)and fide risks. v
C. COST OF, R.I,_SK MITIGAT.,ION `
4tt°a.in'able at a.:reasbnab'le
'The” leVel:. ,o:f �.cceptable'risk must',be ,
co Wit:' Once the sri,ent.fa c estimates of the irarious 7 evelas a .,risk
are :determirfed anaOt#a_ae cost 0f mit gati»g them is- determi�nod, it
shou'4c tl-eri be a'mattex af`"public pb1 j* as o hetli'e we
E ,'. wil lizig t'o s enc (;'the money to° m�,niii2e tli �seL ;r,,4,
In. re arts
s,-'to hazards, the rea3:,'i $ ft, de asst���ia�ed
g,
with sty;' ctur,e rather than' gra�und moVbinerit and often th s �?k�isk'
u„ cyan be° rea WILY reduced at -little orr� no e:ctra ubst. It i 9"%"e55o�tial
to make a dec%sion ralih ,7.x balance fixe cost involved ��*;;th tiio
desix d level
+af ~isk5 thereby minim4..zing ris�C toa poitit�;�'whex`o' it '
beep s acceptable, A.t, th' s po�rit, the pub]:lc is just a�ii�7�ilg tb
a.bso-rb the Bost of reclucing tho r sk 'fuwthox+ ;,
in regard to ev ltia,t,lhg,th.e ,cost. of attaining an ''act,, ptabj,e
level of r ask far geologic well as fire acid flOOd liazat�ds y
two fol `:b�aing tactoxs inentloned„ 1 th,4 �todel eismic._Sa£et`y dement,
id lie'povt ,are of ,interest;,
�� t ml;an
the i isk cif,. in t}� and loss �o`' life due to
soism.,.c }hazards should be no greater than the r sl. off' ari
1i17Ux bi' log of l "e d`uo to disea.s� or due to an ,ccadent. ��
" The redt� tion ,of ask associated with the, hlumdit �elemoym shout ,
be Vein the hik! est pr.y ority
(�j} , , `.,..
. 1, �Y'
The level of risk: in ,xega'rd to broperty damage should be
Cons a doted' acceptable �oxtly' if tie pate Y u1 damagA 3 in
gone a°ry ter is ss, than or eq{aal to the cost of:, meas:tiros;,,',
proposed to be tai en to %itigate the hazard (,assuming that the-
risk, 'to human lafb issatis'fa ods,, in other 'j4ords if ari e,�rth n
,quake` co,tt�.d catzso $x,,600,0.,00 north ;Of ciaiiiagvo tb -exist�.ng
structures whereas, a structural1itp'xoVerient program tduld cost
only StlQ$CO , then the eos of the earthquake risk would 'not
be acceptb�'e ancl< the structiiial tr�rpVement grogram wouldbe
an accLptabIo- dist f �r
;,� % t�bx istt a� the �Urb Bob agy Mas�tet
Plat dor. Calg " to fnd .ngs.
Accod� n
d, (, if �t3ul�.etah 103, 1 7 � a� Pro i<r;ate:ly X55, bi;lx ion
(
77
�q[r iti,}� %
'b Ijbscra binan, Paxtliau ke : ,Earthquakos .;are depi.ctd& .as :to;
their,oc t_on) size, ,and effect of an, earthquake. ' n general know-
1ed'ge of -these teTMS is ess -htial to understanding tie 'nfo:xmation
e` presented, ;iii this -report
�
The location of an earthquake is generaX y ,given as the epicenter
dfthe earthquake. This, is a point on the earthIs su-rf,7ze Ye.T'
above the -ltypocenter o� focus of,� the -quake. The �� atter is the 'point
from whi-hMt'h shock waves first emanite. Howevery as discussed
aboVe,,,earth{. alCes originate from f ult paints ,a e breaks. between
two gut faces o just a point.
Msg i fade describes tltb size oh'
:� riically t is, ee ' in ed, a$ floe lob of the, 'm-NmM'um amplitude as recorded
oh. a standard" seismograph -at D�9 kilometers ,(6�ma�iesj) from�'th yep..
"O te'r.. The ,:mast impaxtaix par of this definity can xs tha t is is a'
log ,scale,- that, is, an: increa*se 1 'o t'.the7 magnittade sca e,
triagri tine 5. to 6'. .Q) xpr'sents . an increase. of <� In, the Fampl� ttirle
' Y of the reco,rl ed 'Wavo. Con°suit 'Table' ` „for rlar�,��cat`an.' It ',sho`ula
eP also be noted that the magnitUd�e pf, an -e; .T�hquake is ,�d;eterm�.ned at a
o cons d'rab1e 1' Stance Trott, he erste t���i e rthqua e. anti that t
„
X - based an rotin�d dasplac ent,,
4 u�
tensity a cribes the degree of,,s-haka:n.g in terms af' the °
damp at a par�tir�ular ,location T Beate tisd`tadays the S�iod-
fxed ero lla . Scale (Table 2) anal 3.�s compa��e,o of � 2 eate�er�es.
(i "`ilei of, „daniage,
i
i
The l7oman, Numeral; are used to eiap h As i Ito th at, °th4 ttx►its, i:n the
scale a '0 discrete categories,; ether tl� r �a :cont nuo�xs ri>ameTital
sequence as is the maTm�.itude scale,,. t important to Ileiae�nber
y
that 14 On-8ity is a v, general descrYt tion. of the el ects of ; an n
earthquake,and``depeads UOT only; an the Si 14 of the quake and the
d3.staA'c,-e to its center)but also on Lhe' quality ref the cons,,tructaon �r
g
flute o loi:a grott�►rl coni itaons .
ma ed and then
that has een da '
c, ` Types of HazAT,as) According to the J-:- d.4 ;A published in
tlxe ,Urban Ce logy Master plan for Calaifnrnia pulletir, 19.8, 2973) tl <>
app' a�tamatei ,.,$8S billio�a ;inn p ojeoteel related geo5a �c-�fbsses
`1970 1_'A7id the years-eb9O ca.n be espe tea, Mated �>a�1ova ate -
between r
softy of the mare =1appropriate' hazards .
"EAkT'HQUA`hl? $HARING' bos,;es Jtoj� earthquake,shaking Will be ,>
gtp��,ter than, 'those ftalft am? other geoiog� c probiem. dost o the
damage
and lass of life w 'I occur ill zones of known high. i�i$mio
activity- Structures• that do (,riot comply with the prcVisions' O the
Meld attd, kiley Acts, .pa,�std is 19a3be es ecielly ulnerab%e�
The USC,%, for, Callforn�:a also :�ttes '�If presentty tochn�tltes
r .
for "reduc-ng losses from earthquake, shaking woro al„p �.,r� to the
ulest clegree� life loss cou1� be reduced. by, a.t ;hast 9b am the,
total,do A r:� value,1Oss•es �cou�.d Ij �°e�t��ced by asp much as t0
' Totalco
s dor perfo�rmxng' trse .reduction work would be about
l,U .. the t taJ prod ectcd loss, t i h' iti+.ith '50”, off6cta.v`eness faro.
VaLie a ben&Z t -'cost rat 1,0. of a:lLt
J
' dvthquakot atop rCapti'U',1 r*. .litbl�. i ' to rr� oIent, shaking of
y. li
1 " is
r- --. —
Z.
r _
TABLE 2 C)
NIOdified hlercaIIi 'Scale of,,Bthquake Int '', es.
is
THE MERCALU;IN EN517Y SCALE IF''
(As.modified by ChArtcs F, R(phtcr in 1956 And eiiarrcangedi.l
It hicit of /hestUecS �estie
are observed # mewryrdrsc
11111 Y'arr ou
�
� lliFie %e y ��
Ci
rthquake shakiijg nut frit kut psi)plc uisiy tih• o» peiJ}ite bilricultlu sland.5haking nutite l f�
serve Marguull rtitlekts til' targe distance Vai lhqual(s b Auto drivers,
Withnuc iilcnti�y%R thea effects as earth uak
�� �.;, q F- 7 �3rhrr r)jrcr;: �11VCf un ponds: wutcr turbid u'lih
cuust.d Amm��ig Ail: trees, structures, liquids; l7 mud. SWatl zIidt:s and +:avlug in slung sand tir;gravr� �, �
hi dies ttt' wAo s>.cuy shi �,ptidtitrrs skin 1uwi ,
w(�i.y� g'3Y . �aah'ks t•xirge hells ring. Futnilurc hrtikc�'kianging
y( >> ubiccts,quivcr
kijer,'on people; shatift leit by those at rest. Srrticturut r�%cCst• ivimsutitp b`,itritvtiyutnage�W
es eciait 'trthc dre indautt,and h thiisctin.it er 1/ hiasttnty C' il5maged, parlfctly_t tila� sin wink erlll'
yi p y'' �"' y�. pp.
�� l�riiirs y 1 , tiasesg sook damage to Ma6iotiryet "i pooh tohittsont
� jjbrt of "omph" Feat hp attest p�t,iRlcAnd mi
�rfi�dttiirs. ChlrnncXS��"t Stucco
t►�cks,ntmi nwm ni wait wells ts.
Ssinte, tan Estimate dutathin eer shaking; gut' niugy •t;laVato 'tanks twist err rull..i carne. l auscic ttYclvcti ttn
vy-nut .rreugnlit shaking sof building"ns ediscd try q/ roundutiuns it not bolted' do*o; i(losd pnncl walls k
119 �artbquaknt the nuking is tike that caused ky the :Yhru>rn tut, poi ayed. piling hrUken:_iilh i
p ssin� of light trucks, -„ 3µ5 ,�
Uriler rfjjecty Ranging objuis swing.
Structural e(J.�ti# Winiitsat or dtiurs i'dt`tCe,
j jr lrer a exry� Changes in flaw W, hemperkturc ttr
y` Wooden whits and frames creak springs and 4, Is drat kz lh' wtt $refund and un sleep
r :i ' SltlpGy, �tC�1,c:� fir, tattis Y31fdCtEd. 1�t�thcFicS b�ftlkEri {,�� " (, '
E#ert on pcapN,Felt b , everyone lntlo rs. Many lrntn trees,
csttinxti ritatlesn ul "hakmiy 'gut •ihay still tray tui StmOUNl rjfects.' Masonry WI t cohiyed Mast Ny f1f
rca:,,if as katised an •adohgoak Tat~ shaking' heaviT' dt.agcxt. su ttkthncswtth cutn:e
is I& that Caused by 1;hc passing or hesvy lrueks, tuiinpseR �`tory li"is5etitttts1y danlugeil. Gencrot
c. though sunrcllmes,instcad. #ttiple bitty rt`el tittle sen• tiamaga lir tiandtttltfn'�r ta�lrl btjtlelute5s lr nal :, ,
$atlnn or �a )Ott. as it a lttSW batt hid mrulk the V �� wiltioj, a f*40 off, Giandyttiiri�. P,ariies racked,
+vol IS : <:� r .�• � �ltescl'lis+�s- teritilisly ilahla��i� t�l�►ergtryunti:pipes
- C?rher greets Ranl}xn trhl:r ts�;t$v ng, Standing broken ((
✓ tluttis rtteis. titakety t Iitt4t x ilisllks r;tEticFttr glusscs
slink
cit �'We"encral; ' ntc t�
r
! I� � >'� �
ylHtnurnt eccystiieni6x c[tt.tssltnxrr swing. �Vbn. tSllrrr fitcrs:iLllnpicutiu > Cs4ktl�tn gniurtd, in
J;iinw�'s rattle 'arc.is if so �� rt )Untl'. sand is Root thruotigh holds
until ptics tr�c Milli a shall rtitteir, und.fit rilddy ottkis.
lodes vii, *OP -h: 'pelt by Cso ui4""Indtsurs kind by wuier luuntains arc formed.
ntu,l prupl'e ti: ttrrs l n.}� rstts� tslinfhte inlf tillly Strtrtvptruf, e0rr4s.,tilust ntusuntQhii {rant, Wile-
tht•dutaiiun ut %44y krlbut dlsu tiro, wtttinn and tures dstrnyycd ulrsltg catch {'herr y ail tttahs, uMe �"
have ito doubt h ti,its, : out ie S�e'pers wrek!�ned. i, tvell.h ill wunden siructuret and tr clg+ 'dastitiyed. A) .
f)thet qJ cls: Naiigthg tittprcts t "Iig.,'.,`liuttt;rt tit Sefiti dtity.agc to ilntns, tllkcY un einhu'jikniehls.
jitClliresMurt,Pcndutuiit;tn4kssttip Motchuhge t'1 ltuilro ds hent !ctightly. }4
urate Stodihr
� autos uck l�t,ct Cry 24shes, dishes
t ttla kir glassO6 Clink 4iquids '0ist�rbGd,,PMo re �/� � ith potiple; ��tichalai'pante
sptlled. Small unstable ob,ws displd d kir 4pso, et 411rettr Lotge, lundslida Wutcr thritwh till '
5lrita°tura! e> ecrt: '1� cak .ptastt;r unci A",)6; t) t banks til •e T hal", rtvert, ttikes, rlw. ynlid acid 111ud thir.
ciauk. 4{'ln4ws lural; tau �.ts "oo,r:fp�n Vr twmp• ted hrerit,tntillll tri iieathes and llal l.tttdr �`'`'
�`", `' :fin°ret�'Grat rjjyrYs,''�c!nerai �eslrurttrrn nlhuilrXings,
#m Oh pvop�e; �,tlt by vverytlim ° Muny are tlildergttiund pipeline cnnlplmvl, out or service.
fri hietwd and trin ti.urs. ps ki
walk ult- t,itiadslsent greatly,
,
stc,)fhl °.
lioer eyfer , Sttia;ll thgtah r,t uh'oof bells ring• Effm ear pIN+pie, rlent`r.11 p;ttilc. „
<� t\ pli.turms thrown uli`wails; tell knacl.s till d batiks till 'Orher itrettt, Same, "I.;fuf.ahleh'slly {, tt�
+lietves knishes fir gtasscs bit lml r FuraitureSari Ysitul vifeils•limit c ne,tti ttitul, the ulu�
ti tt t�rrtwertumed."frees,but issnakMt ttibly, 17hr�}d Y11 r hu b 5 It
� q�utc
t , �y`,,, il' lit'rustlef/ t�,tlilt'F11itt3'i: i dt}"c 1rt�G rit,n51'xtlts(tt,it;ed, i,ltte5'pl M"
� � ,r'►rtcftt„ei eiii+ttS ihiastim'rl i � tlinrtgisil� xisiiiq�' sight 0,10 ikitt tltsltntvd'tDhictls thrilwn ilio dir.
in. lastittry w%A 4hinitttya ttttak kik rtrtil
Ilk P1.14(' .fur,St' tirttkxr�str:nti�.liiCt, itttdi�c5» un• �', i "Ilta3ry:F N" U,04 ' Mt,tsania%hrti unci n, rt lt, ecUti,rt.e4.
gt,ir<et� par,tyti'tti hili wr'�:aity�ll3r�l litttVlnieni� l,1tt - �' ' 4,1khpictt V , 1C41 i lamill t,.rcvs v..-
J tll�i�nteir tt t Q,�rl 'is,i,tt,r,rtr;hr(i n`r,! at„diU� f�ji"JJ ztCco
Zito,tctt,�llrigatitdi rNt�hes �•arai tged. %;� Nfittufets I' 4, wO kmtkru,tr»bi t id ototiirr unrenIIIIN d,
' bittsretr? 1? ira,ai ar+rl,utnnxtlrp alta nuirilf mid w+,ihi1 ntalenalx
• 4• o ,i,l,
tt
a
n
C, Y`,iw ;grcaux cl ,I,ra.dtaced �r sudden. di solacement of rocks twj,,oiv i e w
�=bart:ai s surface ��{�h'Te "Losses e.sp;cx l.ly 7 ifec;t 'ctue to
sha��°ang :From future %, arthqua�Ci �s; can. and. should be re l,tt 0 through
a coinlanation of reastrxe"an�ro7ng'geo]og�� anal
xesearch engxneer'l pt-lice,�, bbi din c cies ur y �a
g A ; � ala 1) at n�Y�;aria r
cu rt , f� scat .and `ix"axat n. Fbl cyy and prepare a rxt iing.
dr s s .
,2
f
ti a
URY OF EA�RT'HQUAKE Mo'Vp-MENT'
1
,
�t9
jVl46
h `
According to tho Etn4tseReLatsssd dust ut d rule d "ab'oq� tYua finch@3' the rocks, the earn► srttrb�:hacde
7�'`; 'heo; , a,fA7lyt ss LhLOpa�tp d� a}xcar along the Sari, nWmds irilo nn unstrai�ier� obits d.
mot�e1�seist untsdstraizs has` Is �l�aati). Rocks hec�;,se dsstorted but ,l?tflioe r ebe rocks past edcl� c�
tlp inC +:e tocks on eilUs side; ]told thei''`r brigind posido's. ' 'ether cretites the 3hdck is lvos.
strbin ,�s trccts ndl6ied by the fFhert ,4 ddcrtmulatet� struts ,
.., �, hquakes. .
rad'aroY phi tin � ' ,, { fs o�Ey oilercomes,t�tn ressstdHca sa/' � f , �' " „
8 I g o the earths ti n
e4e kddta as ell!
A��T� {a, l�' ,ANATTON QP TI1t ��xT1ARY ��t"�hc`I'S t�S� FAzlT,�' ,�40VBNlEN`l�
Apatt ,from re�I' 1tal warping, ti ton , an� general:, change df leve1,
most ' o the,,, Vil ary tector� c„"b ec t v �,canj.e� titi`.� uI"d he a secondary""
=tectbniu E-11 'e
l! lsted willbe of Patilt `;race phenomena. , Field
'a�nvest ga, JO 0_ o' i rtJiquakes duo,,to a.u� ting 'j, xesearched 'by,
stratirph d ��',dgec�mrh evidence
r
such e`°:�iden e 'l 0xpTq sed �n terms ,tf, the d��;S, a;rrem -nt `i6is-
tati"ce Ccamed �b�`�7 crustal te�+s� on ,dxs �ttrf�ari"�'� a1on� 'the ��trt� t line oat;;
xob!6 md,:,-or ftj-alts are many tames e�cfiarerne�r tin ae�sIVL �.rt thas res„,-
I p .Gt s,+h .le les T ;fau;l s are not. 'Tlae passage tin�e 'arta the
F�ffect;; of nature both' tend t.o hide such ovldon6d' ►
�� �'}gyp, mocha its 9,'o� "fatt�.t ba 0! d'k movements (.figured . a.�voiVij .a v'e'ry,
4f �elijeut ,14thi th4. earth's crudt, no mad y.,
s of 8 ALI, . b
long an exitting earthquAke faxzlt r The- resultant tecti�n] c maveme"rid
yt s a
Produce, o! the stress rele�sq;lbet�v�ert the;,t�b o�posk�ng dilates.
I ,
i'r`�tst�Axiri= „ `I'}te�e�oss �,�i 1'cc.uxprirnra} Siong
;tell recti ixlted f�lults Ali6h MiVo ,been detorp e.�
to .e itactive�''
di, evo "s 'Ipasf: t;xper�erice izidica es that smite kt`i e,, fx.u5 is have
o ar banAot 'be recogni,ed at ilio surf, ace. horses tall rt3 uxt nb �
till * from displAco)nent a.�;compaL ft L g eatrtliqua.�es; -but aig,b Prom
iau eroo�y t Mich da"s xace the ground &jbn faulty Without Vi6'.erit
„ eai`t�1tta1:e si't,�:iY
Vei.Y �.�.ft ti-'�an be dime tri,,PrOVi .e TbtectiOn Po strtictur s
proswltl� xr4 pIat , aCTbss aCti.�c iaiil�:s�, she�rt o mdv�ng the 8 r,,aC �
<, , cAu`Fet�il AIM ) t1 oit ses 0ranstuta on be "co'o�►a�iec lies b
f , 1y
1�1
d�, earth uak.'� In Near 'ButtCount),: -it In,
BIutte County are air 1 cn.' �'t t�tbn Tion years o1.d artd ar.e faults
t3 t have been .wit •out xecogz�x ed C u ter`n;axy movem0ht,. These Px'c - r,
'ix to .War}�. fau�.ts; �ave been" .;� na m �t� ,t ft �shoix d Writ be eonsidererl
;. 4 ftdeadf:'. The P el;lxn�nary pa.ult and Geologic Mdp compiled by Charles
i6nixings, in 197 ' through', the else lb re: anna�sisgnc•o ae 3.a1 pho�
tography does nest slYaty evidorice ;of recons ma emettt, but .significarit
seismic ac has occurred in Butt Count than times ink the"-
past as 611 as AktigiiSt 1, :1975` �
-
'. ` Tie fault type, i 1�utte orni'a1, aul,�The• dis:.
Qbunty. - s th'e� n
placenent in •P�rmal fautt�xs �rexrtxcal, cine b,ltacic is �ushecl„ up or
„�
1�Etedu1ii1 e,� they` e x •talocic is t brut down,
a, sP Tha fay /its x.n 13u� e +'linty are generally :a 'northlvest
southo-as 'azure an( are lk-- i1 e eastern, pc►rt on of the;county.,:
t1 w� y
stales af� faul,ts axe �n the :n�.M�hy6st art ,p "the ooup4y: they .
p
T. be� weon `Gh. ca acid Paxad�..e; and xa,r north -note i st to the
Tehama linty 6c xd ex ��'he, fault Nj s tem iiunniiig' 'no th °sand s'oiit,
near Or r�ir lle and tit.e Otbville N:m has been adtive 3n "event ��t's. tr�xy
and Slid, Stu eastern d p o the` Sire-Quaterna�,y, fault slit ace i The:0'
major , l��nowi fault a r the. county as the 13 g B�� d Paul.t 5
north ' 1 f Orovi1le la'ake nd�' ocr�o.ss Hagh�ray 1'�; ct t Jarbn a 3. Tie'
„ f'a.ulta� 1n'.fche vatie:Y' are covdrod' by two li on year. of 01 P -Vial
u de o it dxxectianeg��hri�g<
p ' xt has a has c southeast» t0r.tj. �s
n�'the southern past o ThertnaIito t6rltay.
a
13: to Count. seismic, act' vxt he"fa�' e :Au li t X975 has `bben ,
it y Y g
v'ory 'skoteh'y as- to pest„ earthquake' ina al. fides`. ll ensu.. 108' .and epic
6enter 1:ocstxo �s : rte history of ea � wakes c�. seussed n W r
; GUYton Is 'and Ai . "'stheel's c. ,eport "tlai� h bake Iia ta,rd 1h ltortheast
California" htllps shad 1igli , on the t�iat��'x :�.• `��
Most of the earthq�Ctakes 'all t liay, e had epicentetks tl t tte County
nage' had an intensity lef betwoon 1 and III an the �ictdrfied l��.e dill
scale Some earthquak! s' have be'V, " a ;bit 'high��x: Ziac e am'ple� on
ti i „
April` 19, 1945; an ear ``h� .hake ��7.th _i�' ''epicenter in Paxadd se ;had a
ttta�txmutn intensity of t The quake aiVa.kenod amany ,people ' and :conte
f ,. atnago has recorded,
Ta e sampv � lve k"e p�okeh� ltowerret , no serious
� .. h p
mater x ea
^arthtuak.e hail an intensity of, IV ON) in tie tioriheast
secc�on of" butte Count, The August 1, 19 5 ear�hquaite ,p'rodueed
effeots o about i .ens t)v �:evo11 'VIS' in the Orov'x1le Pa erni�i area,
f,
-'
In the regiph of !416tthedstor��n Ca:li1oeni'A 291 oarthquakes have y
bbon known to ' oecut in th-o last 129 years : (14dwever s 0"nly in the
last fow, decades has there been :a. true effort put forth to record
and studyt oa.rthcluak6s ,) Of these 29 eaxth�,uakes 29 of them „haire
had an intensity of VT c1lW) or groa.tGr: Dr, .Ciiytbn di8cotrored 'that'
r,
eax�tnquakes with a VI (M) or greater intensity in this xe�ga on shad
no obvious pa;tte•rn df recurroilto : In .foot., Soto quakos a, o separa�
ted by a time Interval. of Loss than a Month acid some,'by� a period of
l5 dears, St mush be �ettiemherod, Oat at,prosent `it is not: possible
t6 forecast the tame and size of an earthctuakr-, ;,140 eV' se t ti'
„ 'haza.rd maps ha„V poen Con tx`tictt�d that otttliyte arias that ire
learlyr more he�trdcatzs thin others, ca 'Pro le Av th these maps
that they, are vague artd rettiY.e preoesY4 or�aivatiin and nterpreta-
„ g g � �: 1 rte 1n" tnd8 1sttt31c zoning;) mdps �:uttre
t� cn e,dXca xst an,d�3 �l tY e .� : \
�..x `S 'u't�' ...il^'Si,"t.. ,. � lF`> "+."„v,,.1"• .. � _ .., .._ ., ,.. tl,,. - u ... .u.. kl .
County is placed ,in'a ,low severlty zorie. Ttais means that 'the
0 county; can expect a maximum intensity of V11
In the last 120 years Northeastern /a].ifornia has oxperr en�ed
only ten earthc�uakos w1th intense ty Vr1 (Mn4),. This inen.si( yis
tapabie,�of considerable 'damage to poorly built structures. One.r
bt;her, ``) r� hquake af' .intensi tyr CJI � I was reported but this is_ a1. .
u
hig}i1y uestxohable occurance according,,,,t:,o ,Dr. Gu ton.,,
Since both intensity an magnitu�lo, scales ars °used "to describe
earthquakes ' a t might be well' to explain �nagn�*u�te`.. MaF nitu 0 is1,
�based on a logar,ith'- Ic scale (base. 10� ��or t',� �maxitnum mp tiideof'
a seisanogram. For e.Xa.m�les an increase o='oiaa„ degrod 'an tnagna.'tude
is.,eq,;ttal to 32 titiie:s the -p vi, energy xele.ased. 'Cry other gods,
an earthquake of magnitude �d represents about �32 timed as; ituch
energy rteleased as one of: maftude :gnq� and, so' ''forth (ratite Tab 1'e , �, j i,
N[agnitudes ale 'cal d ul.ated from measurements on selsril gram and 'Most
..off the earthquakes i this area occurred prior to aha xi�stal ati'bn
,
s
of sensitive seismograph stations. 1- , was found flint magnitudes
wore only 'aVai] able for 15._ ehq. cakes in' Northeastoxh Ca.1 iforna a
and thto i nagnit`udes 'ranged from 3 3 to 6.5,. "Of th -1).reo magnitude
6 eafthquakes;,- ane resulted in an intensity of ��I,l A)::and the
other two were :of intensit,�w -vi (ml) b Cons.ideting the ttic�re 'comps ete
retard of intensities arzd ming an admittedly tgnous Goxre'xatin
between, intensity And, magnitide,, it seemst safe . to eoliclude that;;
there is no:t to believe any �erthquake of magnitudeL, g#eater
that_. S has otiginat:ed w'thin the r'�;gion' within t11,t. „span of recorded
hi t�4 -of the- 'r.egibn, �' Dr. Guymon. Fakes 'the �a�i,ave corxeld'tion � r
betti� ,. i magnitude and xnteftsit only,
as a tongue in cheek assutaaptxon
-and goes su !at as tb� call the assump`'tion- flim:;y. It must be re-
MembeTda that, the dostructiv,e t6ng Beach :earthquake o"f. �1 ���' and the
more teceht San Fernando eni°thquake 6f Pebruar.�y q 10,11 had a .
magnitude of 6: 2 and 6, 5�3resp,ectivel��, Some quftkes gate not) catas,-
t'rophes, because they strike where there 'axe no cities to be leveled''
nor ra le to be in `tired, pier»" edam e, thb �:.-
p !? J j p great Sari °rancisca
\avthquake of 1906 only 'had �a \��. cirnum; inti nsa�uy of`'tr (iii) in all of
-.
Nor thea5tern California,, " The Ia Stora c re6ord indicates that gre t
ea'rthquakols occurring outside the regfl
ion 0", -not conc$,
to thok�cit es an counties df Northeast C211fo,rn�.a
P\tCb*,,hNb.ATIONS BASED ON `YHr 'HisT4RIC' ° RtCORDa w tlarthquake
pla.nn fig should be based' on at least a ma ianuitt int,ons ,ty of vx�r
in Butte County.,
u 01. Ci
istor cal zlecoels may indicate a lot��,r��b+b'ty dor frim or
earthgiiakes in Butte County:, Howover y theage ,' destruc'txatl; xnc
lost of life from even a. moderate ,ei�srruc' ��ret1t �
y ixi��a relatr.velyr
nonw-8, I smrrc ars p � o fix, g'r ap
�, a suc�a as t-li�.s, i�' li�;et. � b ` C � e� tern th "n in
a.n active sej,/1 zone rvhex•e rbc ,utions a� e mord tul r develo ed,
y y Bartnqugkp Ha ard, �n, oxtheast ca ern%a
Dr. Gu ton � ��ias stud _
assumes 'tie. ��ro `in a relatively noir-selsMir, ftroal Histori coal recbrds
supportt,-this a.ss�umption'' in fact:, traditionally soismx+rity` has
been compiled from histo al v6cotds This s tixadit ctrl has been due
bo lack of funa8 for the ntec�ssary Tdisma.rch. But thehistox� `''cal
records-, are much toe short oil the tD0 scall of ggpa.ogicai phehOM6e a
to pi ovidb the quality axed gw-th aty of infb!rmation needed to,, ootiplUe
r
t. reliable data of lOng 'Germ "seismicity. $iftce extrapolation , rom past "
�, seismic events is un:rel abl ;1 f�l11 preraut ons. should be taken against
ea"r,thquake,dan"gers, especia,'.1y regai'ciing"dams', aqueducts, coanple,x
t. power network's ` ighS,ta s ; and future power p ants _ „
` TSUNAMI AND SEICHES t 'tsunamis . occtz`r .along coastal' areas , wh'ere '
<, r Wavz. action (commo`i ly ca7:led tidal waves) causes lamag�e�, Tsunamis
5 .are of no,hazard "but•° thela effects are sdmi,.lar to ` s� M_it yes which
w'}
be `potent%a� �y,` haza,xdouS S. Seicl os axe waves produced in stdndi.ng
4, E4 �b;odie:s of taatl x -by winds, atmospheric changes; and tho passage of
earthquake" waves , An area of great concern_I'S, LaR6 0,.,r- iville
wiexe destructive Waves; caused by earthquake actin t,�°``l"a�idslia'es
into, the cake could .cause'. extensive damage and 1,o5s c�: life
a
,anis ides � �v
Lana.s ,ides represent -,only, one step` ire the continuo nati'u �`tz � !
erosional process , The dernonstr"atp in a dramatic -`'Way tl�e
tendency of natural processes to seek a condi tion of equililiri azn.
The 'sieepq slopes of mountainous hillside terrains are "not ;Ln a s"t"ate
of eq�zlib -ium ar��3 tir�rious, erosaona.l processesW act on them to g�'aduallyQ'�
red.u6-e them to near ,s�a level,, Lan.dsli aljig is an important'" a"gent /in
the A cle r Seismically "'induced _landslidetL can be'��catastvoph c,° par-
a
ay - "
ti.c,Plarly ��'�a.f the quake occu `s. duvi,ng or fbilowing` a petaod. of heavy ,
rainfall, The potentia, ,fox la"ndslides epi"sus in' an area of antes-I`
r' ttal landslides and%or areas of unstable s] opes . • This, is especiall:'y
trite whore the slopes have "been materially "nlodifie front, their natur`41
state. La'n.ds,-,-! des can be, roan-induced as a , e ���",t of improper
grading. Ul•d slides cavi be recognized by Ali ";��i`obe- I i k e forms and
the tv� Lk•-like :40:11ows which they leave behindvhem, Probable future
slider /can often be anticipated in areas vFhey�e other landsl aJ,, g has
W aireadj� taken place Slopes covered ;ivy tit' deep soils on hi1.lsides
he a saturate.cii� . ground taater �e potential sl�"de''areas.
v"th
{there bedd ri; or 3oini11 o ''rock materials and hill top directi.gn
tend to be the sante, slide possibill;tieg are greatly' increased,' if
P ;gur4 3. handsIa'des and.
`ether mass imo"vements of. earth
can be t�ij`gered b
quakes " Tbp result can be,
d sash, pis where, de�elopnient , )
� �.b ��� allowed to ` occur o,��
uns �abl ,�� slopes
�`�`
Several. type's Of, "hand.
slides commonly ,ena ountered t=tf, w�-
5
include, � locl glidos, ;� �t ,*.i
C.T cuat4 failures," T[1uctflowsii) rr lit t r `�'`•e'�•
and"ocfls r ads{Fr"{::'{FrF....
4 .v� r. F{rt :r r t_{Prat �
C3 1' {tt� tfFj} � r rr rF ;�`'�► 1�� �� �� f�� ��
'r.
- tar { ; rr 'F{F:F{•..{a
r::Frt'rt{' t t r i.
tr r 11 a g
r{{:'r r �• r r r {r • {
IQ
'"MU0,
(f
., ... ', .. _., .,.._._._.... . ...
q p (1 a a
P
►''4 `' d�rj ear" 2rOc0bc� `► L0554 �i 7 not expectedn t0 be great.Most 69 ,t'he"
y
dsmage'.,wa]l; 6ccut k the hills tie -ate'as>a 1► s' �`rn Cal fa �n �t a '
ar.e underlain by Geno tiic "and' -me s:ozo1C ry'"roc(S
se,vetlty of the,:�roblexns dgp,ends upon the local`"bedrock
tondition,s, „incxuding moIs,t!Dre content, veget�ti,"bit, slops, OnA
0t� 'qT facto s "fr
�
U:Al,theugh 'landsl 'des arxd 1an,dsl e prone atbq,s can be I entx a.ed
.' with,abou.t• 90$ a`ceuraV by,,gea7agiG ,studa,6s `onlay„ a small port�on;l�o£
the `�re`as' s'a' g cut, to and fide<, damag' o has been xap"ped n s�Z x cx,er%�:
detail. for .fecal , g0'vo�cnmen`t '11L-41, se, pl ari�;ing #��� Many,,, � aca� �o r`ern,V "
` mentis 'thus nbt fu1y aoare of the „patentla ' 'land -slide haza`zds <<
T �� C . "> G' 9..
J l4 y } ,7 -
with i n" t�1err j I r �.C�i C 4 l allp
u
„ a
ACT IC7N ]?3 CGP-,, Ce`olag cc mapp� ng at sc lis 'ran,, n 'from'''
l 4 -890 to 1, 6�Z; S- shat 1 be � ca;'xied out 3,,3 aid ;axeas sub�� ed
to
aevelop.ment,,, to' iden,t' fy .� nos � de pxoY�r~ a,'"`eas .cts well as other a''
geologic factory Ci es acid the �,C,unty sill 6':a r,espbxtsx Ulto
see ;�thai this" is., derr'e within their �urisd:41 - Ions pr
�"ox• to app'�o�ral ��
of general <sdave,�bpment patterns. .t The o1og> c m; 19 con be done
by navate cons;u7tan,ts� ,by lace government' sttti, or in coopera
` taax `tii t,ealornia�llviswtxn of A4ines ,,.end '�;toi�gy."� ,, 7
t J
w�
s� a
r, e
Ailed'- ngineering geal c is Ite s tai l s. shaxl bo Tequlred rfo'r'
px�o s d e1e r o men'ts with xn 1a ds a de '`a � l y. rie fide -p One areas r `t
:,.prior rta .des gxt xag . each OVelbpment. These t rdx es, shall; be cax;r. ed
6'pt bf, ptivatel consultai�t��1tt���d by t11e dovelppev, �-roposecl de'�elop,- aI
menta d,«va thinhesie _ area's sbs11 �e engineered to, a��icl or correct
f iiil" slope peo,,16gy Studios, o
w sy)r'Geal o.gac and ent;x r�eL'ririg x pc be r'oviblvod lex ddoe
gtzs y by q�,tal aux ed pra essic�na s and qua lifieb. ''local governnler't
srl a � n peet� xi ius staged of tie .do , Op,tpnt�;,to� insures ��
that
all wv!r: x��ec�ssexy tb'` px"evert future laridsl � rl�'" ;p -r'66" ems 'iso v
being de►e;�.
e•
hAODS46 E 14AZARD8 IN 3 UM COUNTYi, ouo to `Butte Cr)unt'y's
t,�1o`grahYs there are lardy areds c 'potential "la d,§ id4 i'az.ard„iri
teu” halt" Ofthe County, Thi general areas, of cense n iricluder
Cahyons
'Butte Creek i4any6n
,,Chicc
E
nig pmL"to Cie -a Canyon
J.ia
v ke-' Orovill
,:
Slope st"ability is" a plait tactdt used in ddtdrsAg
°hazards, Cenex�ail —op s in "the'so tLrea lr rrlr�g, ate , ng1e greytee
than' 50%, s� .ould be aens,�r 140,4 serftl o. T71e v��getatr 0 corer is also
L.atox":r' ;these arees t�LYe�Cy' ,4�.ztd. e cslbhiee'oming s" rirt�ble�ti
with t1xe inere`ase Op sigb Ani,10
Ade ua,te St qd,Les t c'tent-ial 1a11ds
cd1rviod cut n Atte �.tstirit lie 8twi;o bai ;0001 sl av .a9te teen, '
y gy seer 3�lan"
`
has,, general i e maps v1s c1 alb hot meet tht needs"'�a ` d termxixir
to l .h 6, " d, fa�F:, ut t3'e and�r�s'e p lann :7.hg. r%
1p
CP
Ari!
Xgur
16
71
pp1+�'�� i1'gq'ii ,
WE�.. 'J �W++tM�o
�iln .• E 7 „16. 5] '.. l^"" `4 �'^�i.. r'')wr'�'l INY �w Y.
.1 A�:.,`.ui:4 ENC
44 o ia=
,��. to ' f'tlf! S",•� ( •qS. t 3 , :•�f
u T 17 li-1 �! r�8
i
E 71
�� t,". 1 � � �': I r. �i;y �°"- rwkr. (� �•-..-+u��. +a...w,�..y �� � C?�, .x � � � � �..etTJ 4�,n � � �� � I^�fy�'e� .� ` �`a
Al Kk, LU(J � '`VJ 1
1
f t) I I u �I II t,•' �
1
( S^ �f 4..��y+�•.may
J- . Es`� ��t`rr9 1 '��, � �w�'t"�•r ,_"� 'w . a � �l'�`"''�� �•� �� I u ��r�f� f�, , oa �� � �.t 45 ro L
� �'!� s7. cS 11 ` Y� f tr,,_.3 S: � jJ � � � ;,rF i ii � �` f,t•''� �o � ` �}�.,Irl� � � d. � !+ ,`y '�1^=
it
! j
n ,
i r,; W"I C C �t,' a .�"1*=J. lr.'. ,.'`4 u ' n, �i �` •"a
«� ff r{r5 C) t)
j�ly^ Y �,
P 4',
Pr
M
i r ;' � - N � .�• it has '.. ,'tl � �w 1 ,t ' k° �' �j 1} a i �y '1-�
i�nf» �� "Iw i3
k e o 1 ,,.,,• It. Y� �� j.J'h xi 'nr:pisx .tJ iy
g a Y jJ
1Y wLYi3!�- a� ���
3
� r`.. wy_�=�° ;r,t,�� s q� oma`
.7w `w ''y.,+r«.x_a.. .r..,efG _ n.,•,, av - ....,{ _,,..." .0 �'r,,n0
+IMi
- �l -�-w� r — 1i N.:��.•,rtlx��..........�`V a * , a�M1 .C� "t) .»+..; _ ..��.. <..-u. �m....r.:� �...a.�_..,,� li '.
.' r �"il ,,�� duew�e...�....>a+•� '. � FY . t �� � rl -� I i T r'r+�� 4 rIYY Cy d � ( ��
ww _
=1 xtk Ixfr . x� 1 Y1i'
� �..�(
f�itl�
YW,r A
.r
tltth f, ��• t ` '� �.' ��5�°'' �'� .0 'FJ�, ��� �S�>. " "t o �hYI
'r
u 0 ,1 11 r" C�., tr 17 v y 1`. ( ( l:--",✓' I�S 1 tls
vb
df
lrt(+.,.ter
, U F
1 �
C
Lake Qraira xl e`'s sh e Line'�ameas po�Y�t tq � po�a\\���'��1
fan, 's15..de rTis s• T`he"risk J:nvoI`ves�`wav6 m-ctlon� xn��:a�ted ,£xont
round 'shakin ° da s ant earthquakewhich c;hn otent all" cause
.gib. �ge � P Y
tgirida cuttxn �. 'ureas rhava �a.tx�ata �, off,; cKr sta�ane xanl e ; `
ry ��
Hazarcia�is X50 ha acfiux� st c
,
�7CN-.;� �i� " xpansive Sctxls . 5,�parisalre' sa��. s a're eat Chi 111c1 ET1�'� S
Gtr ,t' f" o . ,n
shr�n�t� `F' en�� lie , dr out p ��nsi'on �s mbstr�o t t ur d r
whit greatly increase �,II % `fume when �, ey absar � �
y y p ear, cause,dN by o
c�av mater�,�1 aim � ma itmor�xlon',te and a oto 9 ;
�`Ii tri. btYi�d ri s e pia don Ox"
ve 'oi�(s, fo ndat,ioh5 °� t
ray � re eat t,�et season d l)'ea�rh" �.ry easnn. h0vements '
�,," ma via y, ,did p�re�,� a;ar.ts o E a, ti,ti�ilding with° the xe'sulFts u
tha-,f-oundat�;oils crack, ,vt'4,, ious dooV9 land 14J down art taarped So ,�.
' th tie
461-tio t fund' i6it pro iFr] Y.
'the r uctve ,,, `ects of 'e paA$1i e s is c trraicle G
r through prop, 4 drainage (and 0u"ditxon design. Xri a7rdtrr to >°
des'gii` an ad'ee�,ti�;e foun�l`ati br1°, ''hotrer tlte� c�incta t i tns3� 42nusti
.�� F v
reoo�gna xed "tlir`aug7i� approptla&te 'lab atory ,P3,ls test ung. hx�
�iic` e)pans'loa. soils are recagidu' i throng ���-pans oli `I'est ofasampies "�
., ; TLt o
� - ++ � � �
Of s"ea.�.. or roes. orb�` xtleans of tae eYY�ret,at�an a�' A'A' enb ,
T' ,1 hits t 0 s t � ,a sta:Ad4td s 1) 0v o- z
�� tL�.S testlrxl� �� oc'edu2 e �
O f 7 \
0 °�5� tubsia,' ��, se-ttlement;,anid fligde�a c�t�an�;; �o x
mar�ei�iefi rea,c7tingti� e'" then a »atarals�tat`�e " of tei{i illbrum or, xeaxr-
arig R+ ,�,� sed h �-3'Ao a da't� or���, cin be ,a hGlzard to G tructuxe$yr
tt't k? ,es n' theav; Qti�it�
lett' er»eh;t `�o'u'du"r in poorly ce�sol` dated sox . dur=%ng ,
x �,
ear `tic a ke," s'hak-N. as, the'�resi.�itt O� w,M` ore ,t fitent ltaxxange
ntent. o x� the'' ndi r.i 1i grrz'ins x S ttlemen suit icient tna n�.� t
hide te�`,gddse sigh, ' c n' structui�a damage associated grit �
ropI'dI OPOAt.ed' alluvial sols or %mp�aperly �ottnded oil pooxly,
l j
ot�ttipsct=ed i 1 � :s ,possibl`ei (figure 11) Yr.
t' `tr
�Tpms'�cac
' n ,
,
r
IFS . 1, ., � • �. +,
\ AI k
ms�rse`tlt"
�`dUbn e3Yt ��� kc
. hqu� bc1
Ih �b ik o� tltie�i4ilclin "(
:► b
igiuni g%adt� II
All p ec! 6n nIIIJI'�`o ur 3 4,/j ! prulser� cohtpt�gle
�' a+ftl c�tia{te, tt6� +r atiji it td(seltl'r .ro ane P���ltiiltb ° !�
GeQak,thdba��€��P,�;el�i+G��lti�t�i�tAaii��.
J
t
q
E ,
r ,
.''�"�.,
�
`l r
r;•
z
L�qu}ric't°Qn oaour; �a><x`ao„ aeduin•"dense w�rtex�sauated
hEsxones itlar�e'xxa1s ivhdh tendo subside and,predom-
nant•1y s"vd) w1l,t is v��u,� ,ed by shock ar st�`a1�1��uio� •asfy
. r °c',�aJcthc�ua v b1t Qn t ciX1 the, matex�a1s te* d to Compact, he:
tater prnssux 1 the sQll increases anti it is xoach; tl e .;point
t}iere� it,�ihecatries . + ual ta' tie ovexbu,rden pressire�.� At this' ;poIin:t
so�� ose ,, a s�strength .anal I queries. �n addition, there,
may, bb a x�ans or urat,er' rom t}i lower�to °upr, ev s; �wh eJ
gib nd ova . � y. s t1van S deet atom ,suf: ce) xnvQ3v ng a r it ek
o '1qu d aon,da t� `roti near th;a •grout s.ur.ce ,•
oro V it ti , +i.6, -`-V,
, s: , �y
� r @,��.1�j:L i'Z1 Jv::.`�i.;��}�.��",.1��c�,Ct,],OA�od! l t2Y].Sf..::�'l�T(11•
proposed p�rci� 0c,'� rtd ,b�,i1'tl'ng?iot��ted °irhefi;4daose •cox 'ltte.du}it�AD
' c dense �att,tfated a It 0,11 sand $�#at`�q e t ,should be evaluated � s
for liquegactaot puten.t�a �: �aris�d��ra n of, 1atex,a spreadb g )1
' cl,, C?i15ti"et� wl�`e staf surface matera4as ante 'tine
"A'ho
a31s� a ,h4 rot �tiol far 1 �que action, , artJ'cu 1t
r 4Y, laxly lora`g st ett ,ri` 1 a14ne rgad emban cincr <s anal t ooc „ ?lalies
is �< Q
subs dor xs a,,lJoca�, mass a.� mb �elmollt o� 190il � aft Volvos
<� nano pa y. � �ie1, ft'l. x dar,rn�ra�� se`rt. �'ri oak sink ngc a th e solid
q <,-e4rtl�` g'�i ooh w�+ 3:r!��xttl.o :o zio hatitolita`! ;platoon wh c dbc-s ,not .,,. .
'at;ctrralcirig a froe Au a.ce, (t�}bst oC the 1r15}ses dt� to, sulysidence
�� ° e :dui o �, s`;Qtx .w atex"}44th rawa.l and hydrgc �mpaction. Bub-
;s'd oe c��xe ci b '-, nc.` ; s C� thdxaWal caaii,�b and ins .en effec r) +,
titre i,7�5 +nit 0 t l c� ,tatex nj ect:Lonl, whe•re� mo.��itara n��"� nd re'gu.;i ati�in
tt 1, are r, � .c r yeas ,subj ected tb subSidenoe by groh.a grater
wc�lt� di;'>.�1va a r�0 1,rel nawn and :5ubs� Bence:_ �'<- be
Axa ;�n gr �a>r�d �; to
with tb th-e bmau 't a rech� r c
a
Action l�:p 'r'
a.1 '',�nv0s�tp � ti", an: idtnti�':i�at�a. o�r'., oteri �)
stt'bs�.dence,p'nsa >le --``aa. s, ser dement �lndl�`ce
4 4Vn'JI 1 i
'rc°tion i> butte 1b�t.3;4s��axl��b noted os:peca`,v'a="uuvloirnent
M
�_► pi,nno •.ar'�apmet bccu 1n such of"area.
�y u
psi, In th�.s, are �rr�� a, fa7•a
,lass bf ���zfe becat s ' vol lAil ropt o ot�ard p�ssilyl ] ;r lass
s the
v c� i ty Ido l�tt�,�, }IaStd ,aft ,� h Lassos, Nit"th ri ca.n be done o
, provent. I,ph(I little can Ibe gone �o Ga �txol vo �c;a , 6 erUpt�.aixs + ,
The pios E 10ctcive 1, 05s to �uCtibA mmas�to is to a:,d ��►��1r�orab10
sl ero a asud r as, tl�e tur,41 d. ,� ina •e cau sos i�bt�n 8.1-0 e "�xom xeccntl y
4, c a ti= rra ca i� c sr1 asp 'Na;j ar uo�; an ` eTuptid,ns+c. are ger�,erally
pracet�ed siria�e etre`rits ;t}la roan �� �rletected ,J�ristrum�ntally,
'and c h s,a b ��� 1 �� �, i
d a rti; dais a.ng.. 0i
am ��Fu` ties'' and''c�it�ntaes sllat,he, fa ea.s `of recent
vc�icanxsm, s}� ;evti1taste the pa,e�ztia doram e :,oto their' .Jtr s� T �l
dcta'cns ,aYid� Lone , r ogu ate the , e opnro�it, �n t iese are s
�1cCl'�I°C�tllfle iV t?e x'ela.ttl�e�t5nVbI1�e
8) ttosi n hazard
� rosaOr! is' t}ae 4genera, woa`x'ing away, ok th sand ,surface,. bye°
dotd"11t�t�np' artd txat ppxty of, go' ati l xb2�} a er s .,thx4augh the
r
Xc,ta on of moving^ water, Ind or ot}ier go, ogI a, `ageAt,4
3� r Gros'.i.on, generally, '�invo,lvesk,'two some'Ohatc dasti''no't-prc��"' e�s,` _ ,�•
the. wear and removal of mater`s ;1,'from gne site and � t'.I t y osx-
n.'tion: at anothr. The'rel�ot�,���' soilthrough erosabn cf� lae '
damaging in situation's' 8hoet ati gully eros�tr'n� off' t ife ar�c1 r7
}� sur£'ace or the erosion oai:
stxecam courses and.: bank
bepds tion,
k�affect5L' ood�as' rivder, a'ke
rprvrirs y and, ma, ruGr ctxby lanijtf.
'man frequently aCCC'fe�',Z'0�1�7n �`P�ai'i�,, dalnclgE'5 a�C�i"Os5e5.
>�xos,ion Z all
relat vely �veh1 QL lint3erstood :and, control
�' �pirob em
in, go,,' far as it ,urban dreas r.,- °' n most areas
under,gi� ng
d6Vel the ,natlital erodi kl ty o� the s0 '1 IS
r fax s Ympertant xn7`'dete*a n �`!g� tie saver xy°� ftituxex�bs ikon „
tf,Eat 11 is they type incl afiot L- hof. 'land' mcidi4ficat10, lk"bexng perforfi;etY.
The .>p,revention� costs o L ex os'1b are 'gonetally, incilided tvi� 3n t o
o control �meas�tres- and in the overall CAs .'�i h�.]asx,de
dev topineitt* "hAdojtc�n githe preextt state;;.£=ie�art prbeures '
for ands:iid� pre ent;7en 1p hii` side areas % l�: ,n mo t cases
eliminate dosses arottght about through e,ros.� -6,1
The tod1i.ctio df erosion fosses in urban `areasOis� the to's..
pans. bility of bci,,`h the developer ,who, -mo if ,es the land surface
' by l ndsca �:�xt� an � rronstx•ud,�ion of ret ay;n;.ng walls' anf� dra3nagO
systems and 41�e .gb� e;nment4dI s.gency wh���h reviews artd canttO' ��Y '�,�
the e,-ent of land, tamli ic`htio.n, Bo.ilo ,litg prod ect co!*161tio%)
the usov,,of the ' ?Per y asswnes t i.e uar}�t�nued responsi i l �` i1,'
wfosion ,control', •e�hrough *aintena"nice of laizc soap ng�„aitx�A 3. 99;-,,
pt '
„-
1
i b . 'tros ion`F Ha Ards in Butb6 �, Gounty l Ai^eas �� h3 ��
and noder,aitz�e Or"(!” ;'ion activity die mapped Ott``�� 'r _12, �?xosiott "
c� actilvitP is g ner' 11 coy"x`°elated to elevat- .0x In �:h �� ar-ea with
tete highest "6ievat�ions geteralV: hawing ;thd,rbighe.,"t evel of u
rbS., n �.GVtV cs <'' u
Cyt
p
if
'B . .�,t?.�AI�N1N' I21�1;.A'Z`S 011�5 Z
,
Gob�.ogic }t�tZ-ards CAn. only be p�.s.ntied fo'' Of OCt3X,bl�y if th.Or
are � �opoxly Aiden � fled. �f j'he sttate, o our 'knotglodge `is�`'Gontinually�
gra r
rowing arLd' ma ys activzt es are ,cgnti tuall;�t e tpand,in ,an
c11ang�ngw , Brom the"-ttant��o�.'nt 6� geo�.o "ic hAzaxds t som►� s atzr
'hata r.esourdts are btv�.ous�y 'mere stXit, d or certain ypos f'oP
Dan's . Activit .e s khan. oth i{s It as Avi t h thia q concept i.n >c�� nc that ,
this alemotit has ptugressea. The var�otts at arcs are �a tifett
cl s giber and de iri aced► a� use` a,Id �on.`ing pol:.cide8c't nd
o��vc� �xtanc s liy�, ra.�� ous lov�elsdf vo ntitont aro then 6,. antined xom
the va e�spo t o hots they,> ran „be ",�lapro ret tc� mafte� ittore ns� ble
use ofIr?au1� land �`esoiirto$ in the gealogio hs ars onvirgnment ► n
' a
V''y
0n - b
u CJ
'fin c7 e,
ne1at�onshj� to other General 'Plan elements
''All," element's of the General Vlti an, are, (to 's.ome dee, related
aha intdepe'rtdei't, This sub -element, Geologic Hp,s, as no
5 different,,in fdti >,'.t red tes tb` a],1-:thF �-el e edits) dxv0,cti'y dx
a. irectly. �T�hti 8 sAction. is onl corn�Aerned ;��tl� l rec t re�,atidn-
n
ships �� an dy� there*,
addresses the J� 1A use Blement, `�i�e :CIrc��
„1 t i6n, t, ement , the k '\casing ; Eri7�eTent � t e *,. c , seri a�yi dri ;and 0 ` r►
A k
a Space 'P dents , and d�ru�;`rts the rater siti-lerrtcnt s Fload
�,d F;i'e Hazards.
�
! 1 d use 11em,ent
d u
They geologic c`ohdI; ��hs a prime de,tehminaxit1 0� `'land ise
Gapa�5c� sties, have to, ie ,,�c:onsid r "'. nth. Land Us , Blei�e lt; ries
�x ubdiv.isaonsxcip+tlse ,co=evcia; c�+mpl:exes, dnd `'ani U'stx�al corrt� � y
�,. please must al's consider) bodrib'd "charadteTiftics. �h s, sub
w
tia_ r t�. �r.,.
element proposes 'stanc,ads :and', Y tea�xa ,ies.i,gnecl to x e;deco'`'7ie o,ss�
xnj1ury and tie da nage to pope^C he pian pxgpdses r'
{, snp,en s
to land ,use onlan'L d`eexmxned=geologicalf ,unfit far,
s�tru.cture�s of h,"uma t occupancy. T t "r.egUla.tes stxd. ti n s, o hutnart
bcc iparicy„ i{� potehti 'i ianclslido areas pr in the.'�path o�f their:l
ai'til The plan en du ages�cnmmu�iaty,� ybv& h � t i pith die
�I osp6dt t. 1oaa1 g dlo.gic Yraxa d� rt ''`The � ",an �a.tiVn�ates, tblar sub
division" desiri withx� ,aree cry .hxgl mist casi'�`'e'`x as ects a
�, p "
r the 10,6a `'haza-rd, iAcldihg �',%q f eguardift dc,signs '°dW'd retaihinent c
o,f natura 1 :heaiaty U67,1
If The .,local �eold��c 1ra%ewotk, affect,�. ; the locataon� and cles�gn
r y} i \I i Li
ht cl �cul,itiiar ac l t�.es i Zh c, e ''ai, eat eax.thtlualce or mus
`tiiple geti .agic dasa hex, evacua,Lt on �rdut�es at d maj or trans�3ortat� ori
" systettts Must Lie lb'cato Arid do.sn'ot3.to promote "tt�ubi�i.%ty, rand ,sfoty:
Coalstrru.ct an tanclaxd show kL
be �moaU ed� do all Citeulation �*
systems in geologa.cally hazardou4 'ard s i , Safety precautions shatt� d
e nstali ed „dn linear sys ;'erns carrying ga.s and (liquids,.., Craver..." n
sing fa.uits car critical, areas of.i Unstable' soils s Rinallyy, it
M slYott k'd ,bei' re,°1' zed�''that the, cost of tonstxuct ng"'a c i'icu�.ati ion ;
„ system is`tvid geo., Ogic hatai1d must`' cons,idor the cost. o miti
' gating r t�Yo haarci w� ,u
r
r, r;
M 4
This st bw ic�m rat, geoldga ry l a.�a� ds .tv� l ai e t housing typer;
'cost ants .�nsit)y Because 'off undez�'l:yjng` gs o ogic conditions, .
dtuol.lihk units, Should oonsxder ihtreasing st-i�, autal: stronigth,
s4 „l ePenddin,g on., the,. geologita r;ondit�d�t, Crew sU�} aX vi.�a.dns wall need
to 3.a�`tfxpd;�� t idt h they t design wk sprit al. sba. s stabi 1i,ia
r. , _i �t Any...off the yabove special Bests.
ta.tSn arttl o� os� ori cdntr
har e to he ah.sd1bbC. the iota :.ng Uhit ,cd,.gt.i
tis ,the a,. i0ht, oX is .el.emp tCr" ' rot the dhvo� opment
y
'�.aar� 1 riot , otigidered " � high ri�hr� � Lair?d Un�tt ��er s�trutttures� o� ,
u ht�mai� atactxpai�ey ,+t� tx �ibe itft in an apoin
,;'
24
Tho ue� has �or_ t't.�he cuxxent, � eft ra�f r
rl.s,cis" 'unaccbpta le,oand for this
reasons the,"Go.0� 6T
n Butte s43iall , {, '"un
PHASE 1
` 1
Up, it3 y gen ogx pr W3 tions w�than the 'Cbun.t xibnd ng
specxa managemo-xl�.. U fo
a 2 . per m to op,p n- s aye ,� a d `u-.g7bs� on , m�
�.' Y p � and deter ne _ o�
toy �s � rx t-ares of human occUpancy,
� }-we op „pub . or fs p ,oryects�; desi�gn� t to., prbyt`t t the
�. Wa1ublic.}rid property from geoogXc ha�.ards.
p.eauest geolo'gi.c stud�,es�; for pr�?posed cieveolitrterit for,`'"�h
pjrr� „human„ occu anc em
Lias ^:tn al crit Itci Lies
f ` and structure$ of h�`gh o`': involuntary cscc'uprncy>4a�than
�'� aroa ntE"t7 rig Scial, riiarlagem+ant . ��
Discourage the locat�zig of structures fox
'uccu
ancy�nr eaaulsall4d
�xd�Vi
f sites and the pa h' of them .eaa th `'' i�bw-.
r f b ter- 6�.lLU
5 lr+ sccsufage �t]ze ecatin of etlti,A�, ' aciIItxe a
in1%t7iUnta:ry�w,r„�� y,�yy#X”-rti!�."�
"4„' ^ ^..tH kc .,;i�M S, "• _4 ;i ��l. ',.,+i., y i.+,� 'G ' '"�I�+°.,. ,'�' r K".t.••.�rvx :rna i-.a., e, � i�rt,s,,,, ,'�Mk�a.:�e . � t fi"'I�'a»'A''=•^^
v ✓+W S .Nbetwonstxuctre eses
amid the
�r ocal geolagi
$ u brt ro rams �,rl�I 7 t�ot�ld Z- y
pp Y�� � a� �l�C�e'�3�i�e.�`.�e�.,����.,��c�a�,4�ir��x�.�'"t' UI1Sa�e'�+�
4f' st�'uo tires and. tlionU retlu re t �i ehaL�lii a.tioh or ��..
rcllad gal
� ) Support :p~ gems d idixc'h w6 � 1 inarease 5e i,sm�:'c s'tlruct q aI „
resstahce standards.. q
r>
1 A)� Do�r lop program's" and pro ceflre8 whIch iia I I i ruro vml thr- ,
geneta,l public andother goU "rnme'ntal agenlcies of s P t,5A i� �; n
g66) oglt h'a a.,rds acid poi 11.ci s, alixch concerntheme
TY GOALt ue ',mproving the Count)0$ rli a t res'�on e��s `tem
l ) ;lt quest „'that ,p�ab icy safel;y� fac'xlltie`�µ,be located desi nerd
h
and managed n a ma.nvor �,h ch� � - ould, nta�:�ar�r� �,� th�eir'abzI' ty
to rema�h function,a.l c�urjn- ' abd a fte- a� mai or geologic
catastx�ihy �, �.
fs), � 0" bos't funds and 'programs to aid n4 tl�,q ab' tt-
unfei;u.tt�ro ti y; `��
1, 4) Reviety and amend this pub- elemO'nt as required a
c�vur o 0
g
J � g' �to
a`ccepta'b' e r. s .. s u i. es .
elan Imlilemeilta,tioxt
AlPHASt 2; Thi iollowing`Olan�d n,:atns �yi1I
t6d;
4,
f'h'b County,
�) I?eltseat►bxndar es of pb-�en^tIL1:, actxveau,l tis o.f:..)
r
soils sins) bc' to a xd ,a.i re s„ and \,it undat on pati s �{ �f
Nv
lanct�l des and ,dam f&* IUVO,jand to dbsj.gnate these ; a eas
as s' Deolog�.o Hazard Are�as,15 �f
u 'd:
.-
rI
: 0 U ❑r
y z '
f? d k
a
¢ 2' bel in areas bj ec' tb� ntensive g'volund slialc
9�ubs idence and 1; ` ue airt i nn, and "a signate these areas
as ''Geologic Mazar V` easy►
M, 3 Cn ,rl_Pdge athroug}1 th0 p arming process 'that `s l�tab c;
d 'uses ,for laid unfit -:dor stTtIct'uxes of humar��dc u
�� t�anc r are:" 'Open, space `dnd, recr'eat�onal uses, ,open parking,
' �tra'sport`at on 'routes , C���:. Gtex�l e5 ,�`. �Co�Tage an Some stIi;d
Requare; a r presentatiAr,e from tl�.e Public Works `Dept.. tp
p 5
be include, on a, Subdivision Revi'eia' CQMmittee
to :monitor
„ 5;untnu in ecta on „of fid ls' g ani. otherY coi�txuc " n
) ,gradin
a y tion' 'to` insure t s`tazdards, of County Building Codes
�' ,
�) Let; geologic data n' the 'Count - be open t�
6,4' -he
public grid local' 'governments Eor ;Tev.,,,e s���"`"a������"
k. Begiiire'.a comprehensive gecia?��- ,,r�'
t?esf o *Ytiu an ,;ci"wtrf�hn specaalgeologc _
'� e��U' yieP�'in�j O LQg�
r'Fs'.i ..a;.. , k. ffia b Call ,enliTY
.�,yt,'{� .s k .«4'I3S.' 7. 1� g. r... K 'TW''�4 ,su 'yam �y� ah r.1 v {� -1iiY° i i:, '7 zCf 1" ,� Fu
YV�!�W "s�txn`x'lr..`:s, t y i'�':��,a�7;L' iw,:`= �,'r���= w�'i
critzca facia'i3es ��.opoec fo, ernl�p-��°x�`' iYe`5, u
�ret{uest fit}at allt� ai�tp�s ��;,�,t'�ent rstan dards }
�. .. be c'ompa tibIt 11�Zt.il"a 1 '}',e Qg7=lam .` a ` 'Cl +` �� Ga y4 C r 1 V
1 c
P IAS'E, a> Ito1'to�vin to �� .adbp i bfh of � h� s elemo fJ 0 :Cotmtyj shad:
SuppQ`-t�iQc41 s' ate afi f�!�d'ex'a ° esed' G�1�jnpTQ'grain's
eoio c +dn sis sea,sttic= esitance,i 5trtctu a1 des gn
g g' �, s �`'
�and 'Ooldgic`'da hstei' re oiise sir .tems. G�u
2 Adopt an o, .d�.nszue pohxbxtxng4
tructures fox lumati
oc:cupant;y as xido p&Ventyiaiiy 'acts°ve fault „ and 1, de'
3 - and in 'the. ifluhda.ti' ih p yth. or an eart)l f16w4'
3` Request' t"ies'Bepa�tment of public iJVnxks ,to cevelc a three ,
st�.aatmei�t pogmam: rust, nirierttor.� 4tiructures.or;
.f" n 1afe tonstruction;x�ii"nsdfe striicfi ral anc� non-st`�rtictura
�� �e emeatu5; .pt_ cronstructIon.,, Grid ci;i ita� tr ats�.fiCa
z ;`` :tat5il, shEond� plat„e �ie��',n`veiltoxied �struc`ture`�' on a prior "_ u 0�
4�t s�t1 ing ha:g��lipst;pr�orit���to Strltct6e, exp'os�in-g % � �
P Y
t �e greate§t danger to tine groatest riutitber of ai'v a and
y ixd, ;adript an brei name requirI g 'the eventual ab ttethudnt
or reinfo`ceme�t of Structures in Qrd4r+�f the5r proritY
. 1 �' ”
Adopt , lft ordinance eSt Jixs�l�ng Viand ts6k etbac�s ,.from
i
i`aults Coils Stirig of i `y�
no b r. lag
ng show x1 stradd le a au�� t
Y
5a t. s'tbac fox crtical farxltes. s
C "`• t) E i F YY a i U
tec{t1.1° a. camparghers�veigeo�.e� i—c grid eng�ne,tirang s1tudj�.
roposed 6o''unty YevIeW :dor c,ri,tical facila
idos 5tlb"
.. -
�46iiss and ,hidhdna�j��roit�ntdr� or.cup�nc}� bu 7�r��ngs, and
y i
lri1 k
a as 6. s3ett16n of the ,�Kmprehehv-
<:a ��og��c axdaengaie�`ng stuy4 td+ crt cad itt t es
CL14d 1"a'3°' poi ects
6'� Support t`lie-evelopmettt of- ,open �p`dee,0, Pitt or reereata.on
�r s tee )oft rjarftd` tiftflt t'or structures or- huifta occupancy',,
(' 1� �a
�iell, 2 ,. w,...,
i
I1 JS
�,._+.•.__,,.n-<,_ , . c „ _ r . y21 _ ,... ��. ,. . �.. v, ,..,., _ N.r.•, .;5;,..r.t,rrtr.�nr",..,,ts.u.w�,, �c